TextField ValueChangeListener setValue()

Vaadin 6 / 7 / 8 Framework UI
1

Hi all:

I have a simple question (hopefully simple)… here is what I am trying to do and it doesn’t seem to work…
Please help with any pointers as I am stuck.

Thanks

Sri

public class Test extends NavigationView implements ValueChangeListener
{

private TextField t = new TextField();

// other stuff…

 private void initUI()
 {
    // create some layout ...
     t.setImmediate(true);
     t.addListener( this );
     // add t to some layout...
 }

  // this is the method I want to focus on...
  @Override
  public void valueChange(ValueChangeEvent event)
  {
         // because valueChange will be fired every time the value is changed ... I thought by removing the listener before I clear the value here should work
         t.removeListener( this );

         String message = t.getValue().toString();
         // do something with message ....

         // when all done...
         t.setValue(""); //keep it blank for next entry.

         // put back the listener
         t.addListener( this );
 }

}

2

OK… after digging further in to removeListener() … it occurred to me that removing listener is posted on to the EventRouter object which is not immediate (synchronous). Hence I see the problem of setValue(“”) firing another valueChange(…) event and going in to recursive mode…

But I thought, my if( !t.getValue().isEmpty() ) should catch to prevent the recursion… it’s not working. I am missing something very silly and would appreciate some other pair of eyes to catch it.

Thank you in advance.

Sri

3

Worked with the condition - it fooled me because it reenters at least twice in to the callback. Removing and adding listener in the callback method was totally unnecessary!